05000281/LER-1981-002-03, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 10 Circuits 1A & 1B & Panel 11 Circuit 4A. Caused by Open Heating Elements.Defective Heat Tracing Tape Replaced

/03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 10 Circuits 1A & 1B & Panel 11 Circuit 4A. Caused by Open Heating Elements.Defective Heat Tracing Tape Replaced

ML18139B050
Person / Time
Site:	Surry
Issue date:	01/30/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B048	List: 05000281/LER-1981-001-03, /03L-0:on 810102,one Boric Acid Flow Path to Core Inoperable.Caused by Personnel Inadvertently Closing Valve 2-CH-226.Flow Path Restored & Personnel Reinstructed 05000281/LER-1981-002-03, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 10 Circuits 1A & 1B & Panel 11 Circuit 4A. Caused by Open Heating Elements.Defective Heat Tracing Tape Replaced 05000281/LER-1981-003-03, /03L-0:on 810106,liquid Radwaste Monitors RM-GW-101,102,RM-VG-103,104,RM-SW-107 & RM-LW-108 Failed Low.Caused by Failed Fuse.Fuse Replaced 05000281/LER-1981-004-03, /03L-0:on 810107,reactor Trip Breaker a Failed to Open.Caused by Sporadic Failure of Under Voltage Device Due to Missing Bushing.Under Voltage Device Replaced 05000281/LER-1981-009-03, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 11 Circuit 4C.Caused by Short in Heat Tape.Defective Heat Tracing Replaced.Design Change Initiated ML18139B047
References
LER-81-002-03L-01, LER-81-2-3L-1, NUDOCS 8102050576
Download: ML18139B050 (2)

LER-1981-002, /03L-0:on 810105,PT-27A Revealed Loss of Heat Tracing for Panel 10 Circuits 1A & 1B & Panel 11 Circuit 4A. Caused by Open Heating Elements.Defective Heat Tracing Tape Replaced

Event date:
Report date:
2811981002R03 - NRC Website

text

CONTROL BLOCK:

Ll!SEE EVENT REPORT I 1.

(PLEASE PRINT OR TYPE ALL REQ.ED INFORMATION)

.._____.. _ _..__~........ ------_..__-6

! V I A I s I p I s I 2 101 ° 0 1-Io 1° I o I o I o I - Io Io 10/ 4 I 1 11 11 11 101 I 10 LICENSE NUMBER 25 26

• LICENSE TYPE JO 57 CAT 58 9

LICENSEE CODE 14 15

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• *61 DDCKETNUMEc°E.R

• 53

• 69 1 I o I s I s l 1 I© I o I 1 l 3 I o I 8 11 I G)

- EVENT DATE 74 REPORT DATE 80

VENT DESCRIPTION AND PROBABLE CONSEQUENCES@

9 With Unit No.2 at 100% power, PT-27A revealed that amp readings for Panel 10 circuit lA

& lB and Panel 11 circuit 4A, were below the acceptance criteria stipulated in the PT.

This event is contrary to T.S.3.3.A.4 and is reportable per T.S.6.6.2.b.(2).

The redundant heat tracing circuits were operable, therefore, the health and safety of the public were not affected.

SYSTEM CODE I sj HI@

9 10

CAUSE

CAUSE CODE SUBCODE

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11 12 COMPONENT CODE IH IE, A, T, E, R,e 13 COMP.

SUBCODE tu@

19 VALVE SUBCODE w@

20 LEA/RO LVENT YEAR

@ REPORT I 8 11 I NUMBER 21 22 l=:.I SEQUENTIAL REPORT NO.

Io I ol 2 I 18 OCCURRENCE CODE Io '3 I REPORT TYPE w

REVISION NO.

~

132 23 24 26 ACTION FUTURE EFFECT SHUTDOWN TAKEN ACTION ON PLANT METHOD HOURS 27 28 29 30

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ATTACHMENT NPRD-4 I..:::)

SUBMITTED FORM SUB.

31 PRIME COMP.

SUPPLIER COMPONENT MANUFACTURER 80 I a I W@-

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.41 42 W@

43

~@Li@ u.J@ W Io lo lo 33 34 35 36 37 IT 11 !8 IS J CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

44 The loss of heat tracing was due to open heating elements There were no indications of physical damage.

The defective heat tracing was replaced and tested.

A design change has been initiated to *change *the manner by which these -borate'd "lines are 'heat traced.

9 i'ACILITY STATUS

% POWER OTHER STATUS @

L!J@ 11 I O I O l@.... I _N-'--/ A ___

9 10 12 11 44

,CTIVITY CONTENT Q\\

EL EASED OF RE.LEASE AMOUNT OF ACTIVITY ~

L:J@) ~(§I N_/_A ___ __

9 10 lf 44 PERSONNEL EXPOSURES Q.

METHOD OF DISCOVERY DESCRIPTION @

DISCOVERY WI PeriQdii;: If's t.

45 46 LOCATION OF RELEASE @

N/A 45 47 BO 80 80 NUMBER A

TYPE DESCRIPTION~

0 I O I O l0GJ@,__ ____

~N.!...:/ A:.:;__ ____________________

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11 1~

13 PERSONNEL INJURIES Q

ao NJJMBER DESCRIPTION 0 j '.0'! ~o :!,0 f (§)L._._ ______

.--=-:c*N-'-": 'Ac.:___ __________________

9 11 12 80 LOSS OF OR DAMAGE TO FACILITY -'4J\\

TYPE

DESCRIPTION

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N.....:./_A _______________________ ___.

9 10

• PUBLICITY ISSUED DESCRIPTION~

BO NRC USE ONLY

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04) 357-3184 EX't 21();8 69 I I I I I ~

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.. ATTACHMENT 1 e

SURRY POWER STATION, UNIT NO. 2 DOCKET NO:

50-281 REPORT NO:

81-002/031-0 EVENT DATE:

01-05-81 TITLE OF EVENT:

HEAT TRACING FAILURE

1.

DESCRIPTION OF EVENT

e With Unit No. 2 at 100% power, PT-27A revealed that the amp readings for Panel 10 circuit lA and lB and Panel 11 circuit 4A (BIT outlet, MOV-2867D and BIT Recirc. return respectively) were below the acceptance criteria stipulated in the PT.

This event is contrary to Technical Specification 3.3.A.4, and is re-portable per Technical Specification 6.6.2.b(2).

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT EQUIPMENT:

The heat tracing circuits are intended to maintain a fluid temperature above

• that-,,u-e*eded 0for***,fl,ow. *-.:'.flie 11:edundant**heat tracing circuits* were operable, there-fore, the health and safety of the public were not affected.

3.

CAUSE

The loss of heat tracing was due to open heating elements.

There were no in-dications of physical damage to the heat tape.

4.

IMMEDIATE CORRECTIVE ACTION

The immediate corrective action was to verify that*the redundant circuits were operable.

5.

SUBSEQUENT CORRECTIVE ACTION:

The defective heat tracing tape was replaced and tested within the time span specified by Technical Specification.

6.

• ACTION -TAKEN *To PREVENT RECURRENCE:

No additional actions were deemed necessary.

7.

GENERIC IMPLICATIONS:

A task force has reviewed the total spectrum of the Heat Tracing System and a Design Change is being prepared as a result of the Yask Force Study.

Long lead items are being procured.